Valve Seat & Guide Machining
The most critical sealing surface in the valve train assembly is between the face of the valve and its seat in the cylinder head when the valve is closed. Leakage between these surfaces reduces engine compression and power and can lead to valve burning. To ensure proper seating of the valve, the valve seat must be:
- Correct width.
- Correct location on the valve face.
- Concentric with the guide (less than .002˝ runout).
The ideal seat width for automotive engines is 1/16˝ for intake valves and 3/32˝ for exhaust valves. Maintaining this width is important to ensure proper sealing and heat transfer.
Just as important is the correct angle of the actual faces on the seat, a valve seat with different face angles to the corresponding valve would be next to useless.
|The diagram alongside shows the valve seat angles for an Exhaust Valve Seat.
|Cutting valve seats requires an accurate machining process to ensure that the minimumamount of material is removed while achieving the correct seat width and angles.|
|Here at Auto Services we use a Serdi 3.0for our valve seat and valve guide machining.
All 3 angles on the valve seat are cut in one pass allowing us to give our customers the very best machining
We can machine the valve seats on the majority of cylinder heads, please call for latest prices.